Apparatus for teaching geometry.



1. oH, CARSON. APPARATUS FOR TEACHING GEOMETRY.

APPLICATION FILED NOY- II. 1915.

' I x 's f lttolcug sul l. OH. CARSON.

APPARATUS PoP aAcHmG GEOMETPY. l APPLICATION FILED Nov.`l1, 1915. y

1,250,796 v u v Patented Dec. 18,1917.

3 SHEETS-SHEET 2.

lune P1 rofll J. OH. CARSON.`

APPARATUS FOR TEACHING GEOMETRY.

APPucATloN FILED Nov. l1. Isls.

Patented D@.18,=1917.

3 SHEETS-SHEET 3.`

'30 tions, constructions,

entrev sraaias PATENT @mmm-.f

. JOSEPH oHARA CARSON, or NEW ORLEANS, LOUISIANA. p .l

y APrAnATUsFoR TEACHINGGEOMETRY.

' specification of ,Lettersl Patent.`

Appiieation med November 11,1915. serie1Ne.eo,93s. i

To VaZZ whom t may concern.'

Be it known that I, JOSEPH OHAiiA CAR- soN, a citizen of the United States ot' America, residing atNeW Orleans, inthe parisliof 5 Orleans and State of Louisiana, hare" invented certain new and useful Improvements in Apparatus for rleaching (,ireometry7 of Which the following is a specification, reference being had therein tothe' accompanying 10 drawing, I .A K

This invention relates to means for facilitating the teaching ot' geometry and has for its object the provision of means for assisting a pupil to comprehend the construction 0f any geometrical figure wherein lines and planes are employed.

In teaching geometry it has been found Very diliicult to havechildren 'imagine or Visualize ligures `of a number ot'diii'erentdimensions when drawn upon a at'blackboard'. By means otjthe structures claimed, all lines and planes are in their correct positions, thereby permitting the problem illusl trated to be 'readily'gra'sped by the student. Another object of this invention isthe Aproduction ot' an elicieiitjmeansof illustrating the construction ot' geometrical ligure's. With these and other objeets'in View, vthis invention consists of'certaiii novel combinaand arrangements of parts, as willbehereinafter fully described andclaimcd. f i' ln the accompanying "drawings Figure l is a perspective'-vie\if"otfthe apparatus used Iin demonstrating two simple geometrical problems.4`v l Fig. 2 is aside kelevation of thestr'ucture shown in'FigJl e `Fig. 3ds a fragmentaryside'elevation ,of 40 the opposite side of the "deiice''as shown in `;l1\]g.r2.i i" V1 1V "Il". Y Fig. 4,'is a bottomgplan'yiewfof tliestructure shown in Fig'. S-

Figz is a top plan View ofthe structure isliown in Figs. vla'nd 2. "5i F'g. 6 isl a'sectionftalten'online 6-i6'of Fig?" l 'l f Fig. 7 is a section taken online Iy-7 of 0 Fig. 8 Aisa section taken on 'line 'S-Sfof Fig.` 9 is la' detailed; perspectiije ofy an em- 'bodnient ofthe apparatusA whichmay be 'ing Aat right *angles to Ythe appended claims.

' toindicate th usedlor demonstrating he construction of certain geometrical figures..v Y

Figi() 1s a top plan View of the structure 'illustrated in Fig. 9.

Fig. l1 is a vertical'section taken online n .ii of Fi-.1o. e

VFig. l2 is a Vertical section throughv the central Vertical rod ofthe structure shown Patented Dee.- 18, 1917.

in Fig. 9,showing the manner in which the *i radliating Wires or rods are connected there- Witi.`

Referring to the accompanying-drawings Vby numerals it Will be seen that tliestructure illustrated in Figs. `l' to 8 inclusivecomprises a vertically extending panel l constituting one plane anda longitudinally extending panel 2 constituting asecond plane extendthe.l first-mentioned plane. These panels l and '2 are arranged to i constitute `a substantiallyk cross-shaped ligure 1n cross section soas to produce a plane lat right angles upon each side of thedemon- "stratin'g apparatus. "'si'deringFig. fl'that the ends of theplanegor #panel 2 terminate short of lthe endsoftlie fpanel l fory -permitting the Vapparatus to be It Will be seen by con- `conveniently handled and easily :reversed 4When so desired. 1

-spirit of theV Vinvention and that any desired detailed mechanical changes may be made-so Itsho'uld be-understood that the"appa ratus lherein l"illustrated, described, Yand.

long as the device isl confined to tlie'scope .of p

In Fig. 2, uponf'the lupper panel 1, there is illustrated the fol-lowing proposition .'-"Througli a given' external point there ycairbedraWnonefline perpendi'c'ular toav ygiven plane, and only one.

In illustratinggeometrical' figures andwfor lthe purpose of making the propositionclear 'to afstudei'itior pupil, construction lines lare and vindicated by the' numeral 3. Itl ofcourse should' be understood that any suitable or indicatedy ina' 'solid Vc'olonsuclias in Fig. 1

All conc]usionsl tobe provedjor lines to` be *provedareindicatedby a diferent'color so las t'o' be; readily distinguished from the con- 'struction "lines,- i the color being' e'ml'il'oyed "preferably Abeing' redf or? :some others'itable the development of a means ot teaching geometry whereby geometrical figures may be illustrated by using a plane surface and indicating imaginary lines of a geometrical figure by means of strips of thin material such as wire, string, or any other suitable or convenient material.

Where the term thin materiali is employed in the following claims, it should be borne in mind that said term is used in a broad sense indicating any suitable material for illustrating certain imaginary lines of a geometrical ligure to be illustrated wherein imaginary lines are employed in a geometrical problem.

It should be understood that any geometrical ligure may be formed by using the means illustrated and claimed, although the dili'erent designs and shapes of the ligures may be changed to produce anywhere from eighty to one hundred different i'igures. Only two forms have been illustrated in the drawings to indicate the manner of construction and method of arrangement of the different portions of the figures to illustrate any given geometrical figure.

It of course should be understood that any suitable material may be employed in manufacturing these demonstrating ligures, with- Copies of this patent may be obtained for live cents each. by addressing the opposite end secured to a right angularly extending plane below said first-mentioned right angularly extending plane said thin strip of material being used tol indicate cerfrom the spirit of the invenat an angle thereto towardVv tain angle lines employed in constructing geometrical figures.

An apparatus for facilitating the teaching of geometry7 comprising a body, construction lines formed upon said body, and thin strips of material secured to said body and used .in connection with said construction lines for indicating certain angle lines of a geometrical figure.

In testimony whereof I hereunto aliix my signature.

JOSEPH OHARA CARSON.

Commissioner of Patents,

Washington, D. C. 

